Pakistan has the second largest Muslim population in the world after Indonesia. Sunnis are the majority while the Shias make up between 10-20%. Pakistan has the second largest number of Shias after Iran, which numbers between 17 million to as high as 30 million.
The study of Islam in Pakistan is for all Muslim students up to Matriculation or O'levels in all schools. There is no law in Pakistan enforcing hijab and wearing of Hijab by Pakistani women is fairly uncommon. However, the practice of wearing Hijab among younger women in urban centers is slowly growing due to media influence from the Middle East and Persian Gulf countries.
The country's largest mosque is the Faisal Mosque in Islamabad. It is also the largest mosque in South Asia, and one of the largest mosques in the world. It was the largest mosque in the world from 1986 until 1993, when it was overtaken in size by the completion of the Hassan II Mosque in Casablanca, Morocco. Subsequent expansions of the Masjid al-Haram (Grand Mosque) of Mecca and the Al-Masjid al-Nabawi (Prophet's Mosque) in Medina, Saudi Arabia during the 1990s relegated Faisal Mosque to fourth place in terms of size.